class_docstr: Data structure to store a particular path between 2 nodes.
code: def __init__(self):
      self._is_blocked = None  # To store if path is blocked
      self._condition_vars = set()
  
imports: import networkx
  from dowhy.utils.graph_operations import adjacency_matrix_to_adjacency_list
label_desc: Use image node_id 1 to create a new Path object  with example: obj = Path()